bazel-hello

Noraml Build

This showcases how to build a single file to create a runnable application.

This BUILD file shows that we want to build a C++ binary using the cc_binary rule provided by Bazel. The name of the binary will be hello-world In the cc_binary rule, let's name the binary hello-world, and provide the required source files in the srcs attribute.

cc_binary(
    name = "hello-world",
    srcs = ["src/hello-world.cc"],
)

bazel build //:hello-world

If the build is successful, Bazel prints the following output:

± |master U:1 ✗| → bazel build //:hello-world
INFO: Analysed target //:hello-world (7 packages loaded).
INFO: Found 1 target...
Target //:hello-world up-to-date:
  bazel-bin/hello-world
  INFO: Elapsed time: 1.386s, Critical Path: 0.80s
  INFO: 3 processes: 2 linux-sandbox, 1 local.
  INFO: Build completed successfully, 62 total actions

In the run log above you can see where the executable was built so you can locate it and use it.

Adding the submodules and then build

Adding a submodule and using that. Here I am using immer project to be used inside my hello-world project.

add gitsubmodule

create a directory where submodules would be located. external in this project's case.

adding the submodule.
git submodule  add [email protected]:bansalnvn/immer external/

this repo already has a bazel BUILD file which exports the immer library and visibility is defined to public.

in hello-world we can set the dependency as
 
    deps = [ 
    	":hello-add",
    	"@immer//:immer"]

Last thing we need to setup the location of the target immer in the WORKSPACE file as follows.

local_repository(
		name = "immer",
		path = "external/immer",
)

and now we should be able to use immer library in our hello world project.